If you wanna knock out some of the big tourist spots while here, head down to Centennial Park. For one parking fee, you can hit up the CNN center (headquarters for CNN - you can take a tour while they're on the air), The Aquarium (world's largest) and the World of Coca Cola (best part is the end with coke products from all over the world. try the beverly - it's gross, and inca cola and bebo pine nut - my faves).

For food, I would recommend FLIP (gourmet burger joint owned and run by Richard Blaise from Top Chef), R thomas (24h diner in midtown with lots of organic / vegan food but actually yummy), and Chow Baby (mongolian bbq joint).

As others have said, after living in BOS, the public transport here is joke. Parking is MUCH less than there and you need a car to get everywhere. Don't bother with MARTA - drive and you can find free or inexpensive parking anywhere in ATL.